package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    @Override
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {

        //DishDTO包括Flavor对象集合，Dish不需要
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //插入1条dish对象
        dishMapper.insert(dish);
        //获取dishMapper生成的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            //批量插入n条flavor对象
            dishFlavorMapper.insertBatch(flavors);
        }


    }

    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {

        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());

        //返回数据要包括categoryName,联合查询category表封装到DishVO中
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);

        return new PageResult(page.getTotal(),page.getResult());
    }

    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {

        //启售中的菜品不能被删除，查询是否存在启售菜品
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                throw (new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE));
            }
        }
        //关联套餐不能删除，查询菜品是否关联套餐
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            throw (new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL));
        }
        //批量删除菜品信息
        dishMapper.deleteByIds(ids);
        //批量删除菜品关联的口味信息
        dishFlavorMapper.deleteByDishIds(ids);
    }

    @Override
    public void update(DishDTO dishDTO) {

        //更新菜品数据
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.update(dish);

        //把关联的口味数据删除
        List<Long> ids = new ArrayList<>();
        ids.add(dishDTO.getId());
        dishFlavorMapper.deleteByDishIds(ids);

        //添加新的口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dish.getId());
            });
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    @Override
    public DishVO getByIdWithFlavor(Long id) {

        Dish dish = dishMapper.getById(id);
        //查询口味信息
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);

        //封装成DishVO对象
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    @Override
    public List<Dish> list(Long categoryId) {

        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    @Override
    public void startOrStop(Integer status, Long id) {

        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();

        dishMapper.update(dish);

        //菜品停售，关联套餐也要停售
        if (status == StatusConstant.DISABLE) {
            List<Setmeal> setmeals = setmealMapper.getByDishId(id);
            if (setmeals != null && setmeals.size() > 0) {
                setmeals.forEach(setmeal -> {
                    setmeal.setStatus(StatusConstant.DISABLE);
                    setmealMapper.update(setmeal);
                });
            }
        }
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
